Journal
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
Volume 97, Issue 5, Pages 271-276Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00202967.2019.1646458
Keywords
Vickers indentation; fracture toughness; boronising; alloyed ductile iron
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In the present study, copper (Cu), nickel (Ni), and molybdenum (Mo)-alloyed ductile iron was pack boronised at 800-850 degrees C for 3-6 h and subsequently the microhardness and the microstructures of boride layers under different process parameters were investigated in detail. Further, Vickers indentation fracture toughness tests were executed on borided surfaces under 200 g load. The fracture toughness of borided layers was estimated separately by a series of equations and the half-length of corner cracks and the half diagonals of Vickers indents were used as variables. Generally, the values of the obtained fracture toughness were found to be higher than those of previous studies. It was found that thinner boride layers were formed at lower boronising temperatures. The highest toughness value and the thickest boride layer were obtained in the sample boronised at 850 degrees C for 6 h.
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